Frequently Asked Questions – FAQ

Evaluation method for assessing the energy and environmental performance of new buildings

One of the indicators used in the evaluation method is the summer comfort indicator (DIES), which will become mandatory once the calculation engine is made available. Is there any information on a timetable for this requirement?
This calculation will become mandatory in a 2nd version of the calculation engine as part of the trial scheme (notably with updated RSET values).
There will not be any time limit, but ministers are hoping to capitalise on this indicator and its uptake by operators on the ground.

The evaluation method takes into account the production of solar energy and cogeneration. What about wind energy?
Wind energy is not taken into account at this time. Where required, an operational Title V case study may be applied for renewable energy produced on site that has not been taken into account by the evaluation method.

It is indicated that the “ENR Rating”, allowing operators to determine the conversion coefficient between final energy and primary energy for district heating systems, will be defined in a ministerial decree. As far as we know, this order has not yet been issued. When will it be?
For the reference framework, the ENR Rating for district heating networks already in service will be published. Initially, this publication will occur online along with the reference framework.

“For buildings connected to a district heating network, the CO2 content of energy consumed is declared via the district heating network, and published in ministerial decrees. The CO2 content of district heating networks will be calculated based on a life-cycle analysis.” Is the ministerial decree mentioned here the one pertaining to CO2 content of district heating networks (used in DPE) or does this refer to a new ministerial decree? Will GHG emissions indicated in the Network Title Vs be usable?
Initially, the CO2 content of district heating networks indicated in the DPE (Energy Performance Diagnostic) ministerial decree will be retained.

Leak of refrigerants from equipment:
Where detailed HVAC calculations are involved, environmental equipment declarations (PEP) will be taken into account. Certain PEP values already account for a level of refrigerant leakage in equipment using this type of fluid. In other cases, the evaluation method defines the way in which leaks and their impact should be calculated. What can be done to avoid double counting?
In order to employ PEP values correctly without double counting, it is necessary to deactivate the “use” stage of the life cycle; i.e. Module B for that PEP.
PEPs are calculated using formula-based scenarios for energy consumption during their use phase. However, the trial scheme’s calculation methods use energy consumption results from the calculation engine to determine the environmental impact of the building’s use phase. To avoid double-counting energy consumption during the building’s use phase, it is therefore necessary to remove the impacts linked to energy consumption from the PEP (content of Module B6 for the PEP) - this may result in 1 of 2 circumstances:
  1. if module B6 cannot be deactivated independently, users must therefore deactivate all of module B. Doing so will also lose all information pertaining to the recharging of refrigerants during the use phase. Given that the impact of these recharges is significant, the Positive Energy, Low Carbon buildings evaluation method defines a method for their calculation: cf. 3.1.1 of the evaluation method
  2. where module B6 can be deactivated independently, users need only to do so; the calculation formula for refrigerants indicated in the Positive Energy Low Carbon Buildings evaluation method does not need to be applied.

Leak of refrigerants from equipment:
In the event that operators revert to the simplified method for Work Item 8. HVAC (use of flat-rate values), does the impact of refrigerants need to be accounted for elsewhere?
Where operators choose to use the simplified calculation method, the impact of refrigerants is accounted for in the same way as in the detailed method.

How can users carry out energy and environmental performance assessments for buildings connected to district heating networks?
In order to calculate the BEPOS report, users will need the “ENRetR” rating for the district heating network. These ratings are provided in Annex 6 of the reference framework, and are calculated based on 2014 operational data.
For the calculation of environmental impact, users will need:
  • the name of the district heating network
  • the network type (gas, biomass, etc.)
Based on these elements, users will then need to create a standard environmental declaration, incorporating:
  • the CO2 emissions factor, which is specific to each district heating network. Until the publication of the upcoming DPE Ministerial Order, the CO2 content for district heating networks (calculated based on operational data from 2014) is provided below.
  • other impacts, provided according to the type of heating network. These are provided in Annex 3 of the reference framework (and are also available on the INIES database).
Eventually, each district heat network will have its own standard environmental declaration (Déclaration Environnementale de Service).